title: Selenium-mediated inhibition of 7,12-dimethylbenz[a]anthracene-induced mouse mammary tumorigenesis.
abstract: The effect of supplemental selenium on 7,12-dimethylbenz[a] anthracene (DMBA)-induced mammary tumorigenesis was investigated in several mouse strains. Selenium, administered as SeO2 in the drinking water, inhibited mammary tumor formation in DMBA-treated (C57BL x DBA/2f)F1, C3H/StWi and BALB/c female mice. In addition, selenium inhibited the occurrence of DMBA-induced ductal hyperplasias in (C57BL x DBA/2f)F1 and BALB/c mice and mammary tumour virus-induced alveolar hyperplasias in BALB/cfC3H mice. Selenium did not alter the growth of established mammary tumors. These results demonstrate that supplemental selenium inhibits both chemical-and viral-induced mouse mammary tumorigenesis, and secondly, that the development of preneoplastic lesions, an early stage in mammary tumorigenesis, is very sensitive to selenium-mediated inhibition.
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000037:antagonists & inhibitors* / Q000633:toxicity; D000818:Animals; D001551:Benz(a)Anthracenes / Q000037:antagonists & inhibitors*; D002273:Carcinogens; D008325:Mammary Neoplasms, Experimental / Q000139:chemically induced / Q000517:prevention & control*; D051379:Mice; D008815:Mice, Inbred Strains; D009368:Neoplasm Transplantation; D012643:Selenium / Q000494:pharmacology*; D013045:Species Specificity; D013997:Time Factors
chemical_list: D001551:Benz(a)Anthracenes; D002273:Carcinogens; D015127:9,10-Dimethyl-1,2-benzanthracene; D012643:Selenium